# STC SA09394AC-D - Type: Supplemental type certificate - Status: Current, Issued - Holder: S-TEC Corporation, United States - Description: Installation of S-TEC System 20/30 Single and Two Axis Automatic Flight Guidance Systems, Model ST-847-20/30. - Applied: September 24, 1998 - Status date: September 24, 1998 - Product: Aircraft, Single-Engine - Certification basis: Part 21 - Data sheets: [TCDS 1A13](https://openairdocs.org/tcds/1A13) - Certificate PDF: https://openairdocs.org/files/sha256/95/72/95727bedcfbc53c18f79b11df6af3bb2566887cd3c40f8a2667e1d0046384912 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/19B11B9F95D5B78285256CC1007F3ADA.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA09394AC-D ## ADs that name it (0) None. ## Approved models (2) - REVO Incorporated Lake LA-4 ([TCDS 1A13](https://openairdocs.org/tcds/1A13)) - REVO Incorporated Lake LA-4-200 ([TCDS 1A13](https://openairdocs.org/tcds/1A13)) ## What the certificate says This is OCR from the scanned FAA certificate. OCR can misread letters and numbers. United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA09394AC-D This certificate issued to: S-TEC Corporation One S-TEC Way Mineral Wells Municipal Airport Mineral Wells, TX 76067-9236 Certifies that the change in the type design for the following product with the hitations and conditions theirfer as specifed heron meets the aircorthiness requiements of Fast 3 of the Cirl-ti Regulations. Original Product I ype Certifeate A umber: IA13 Make: Lake Model: LA-4 and LA-4-200 Description of Type Design Change: Installation of S-TEC System 20/30 Single and Two Axis Automatic Flight Guidance Systems, Model ST-847-20/30, according to Bulletin No. 947, Revision 1, dated 9-24-98 and Master Drawing List No. 921133, Revision A, dated 9-24-98 with Optional Yaw Trim System or later FAA Approved revisions of the above data (14 Volt System). Also eligible on Model LA-4-200 When Modified Per STC SA114NE (Speed Kit). (See Continuation Sheet, Page 2, a part of this STC.) If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission. saspended, veroked or a termination date is otherese established by the A dinistator of the Federal d vintion Administration. Date of Application: 9-24-98 Date Reissued: Date of Issuance: 9-24-98 Date Amended: By Direction of the Administrator FEDERAL AVIATION all 12 (Signature) TOMINSTRATO Michael Keirnan DAS Staff Coordinator, DAS 5 SW (Title) United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA09394AC-D Limitations and Conditions: (con't.) 2. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891812, dated 9-24-98 is required for Lake Models LA-4 and LA-4-200 And Model LA-4-200 When Modified Per STC SA114NE (Speed Kit) for S-TEC System 20 or later FAA Approved revisions of the above supplement. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891819S, dated 9-24-98 is required for Lake Models LA-4 and LA-4-200 And Model LA-4-200 When Modified Per STC SA114NE (Speed Kit) for S-TEC System 20 with Optional Yaw Trim System or later FAA Approved revisions of the above supplement. 4. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891813, dated 9-24-98 is required for Lake Models LA-4 and LA-4-200 And Model LA-4-200 When Modified Per STC SA114NE (Speed Kit) for S-TEC System 30 or later FAA Approved revisions of the above supplement. 5. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891814S, dated 9-24-98 is required for Lake Models LA-4 and LA-4-200 And Model LA-4-200 When Modified Per STC SA114NE (Speed Kit) for S-TEC System 30 with Optional Yaw Trim System or later FAA Approved revisions of the above supplement. 6. Compatibility of this modification with other previously approved modifications must be determined by the installer. TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) . (Address of transferee) . (Number and street) (City, State, and ZIP code) from (Name of grantor) (Print or type) (Address of grantor) (Number & street) (City, State, and ZIP code) Extent of Authority (if licensing agreement): Signature of grantor (In ink): ## Every issue (1) - September 24, 1998: Issued, Current. [certificate](https://openairdocs.org/files/sha256/95/72/95727bedcfbc53c18f79b11df6af3bb2566887cd3c40f8a2667e1d0046384912) --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.